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Share-based compensation plans - equity-settled and cash-settled (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	$ 18,821	$ 18,433
Expenses (recoveries) under its cash-settled plan	3,597	134
Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	4,744	4,941
Performance Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	7,690	6,186
Restricted Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	2,542	2,833
Employee Share Ownership Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total compensation expenses under equity settled plans	3,845	4,473
Deferred Share Unit Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	2,922	(42)
Phantom Stock Option Plan [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expenses (recoveries) under its cash-settled plan	$ 675	$ 176

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2018-03-16

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 51
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_51_a&doctype=Standard
-URIDate 2018-03-16

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